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STLC5464 数据表(PDF) 75 Page - STMicroelectronics

部件名 STLC5464
功能描述  MULTI-HDLCWITH n x 64 SWITCHING MATRIX ASSOCIATED
PDF  83 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STLC5464 数据表(HTML) 75 Page - STMicroelectronics

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IX - EXTERNAL REGISTERS
These registers are located in shared memory. Initiate Block Address Register (IBAR) gives the Initiate
Block Address (IBA) in shared memory (see Register IBAR(34)H on Page 73).
‘Not used’ bits (Nu) are accessible by the microprocessor but the use of these bits by software is not
recommended.
IX.1 - Initialization Block in External Memory
Descriptor Address
Channel
Address
bit15
bit8
bit7
bit0
CH 0
T
IBA+00
Not used
TDA High
IBA+02
Transmit Descriptor Address (TDA Low)
R
IBA+04
Not used
RDA High
IBA+06
Receive Descriptor Address (RDA Low)
CH1
T
IBA+08
Not used
TDA High
IBA+10
Transmit Descriptor Address (TDA Low)
R
IBA+12
Not used
RDA High
IBA+14
Receive Descriptor Address (RDA Low)
CH 2
to
CH30
IBA+16
to
IBA+246
CH 31
T
IBA+248
Not used
TDA High
IBA+250
Transmit Descriptor Address (TDA Low)
R
IBA+252
Not used
RDA High
IBA+254
Receive Descriptor Address (RDA Low)
When Direct Memory Access Controller receives Start from one of 64 channels, it reads initialization block
immediately to know the first address of the first descriptor for this channel.
Bit 0 of Transmit Descriptor Address (TDA Low) and bit 0 of Receive Descriptor Address (RDA Low), are
at ZERO mandatory. This Least Significant Bit is not used by DMA Controller, The shared memory is
always a 16 bit memory for the DMA Controller.
N.B. If several descriptors are used to transmit one frame then before transmitting frame, DMA Controller
stores the address of the first Transmit Descriptor Address into this Initialization Block.
STLC5464
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